一.集合的操作 1.什么是集合?     集合是一个无序的,不重复的数据组合,它的主要作用如下: 去重:把一个列表变成集合,就自动去重 关系测试:测试两组数据之前的交集,差集,并集等关系   2.常用的操作 将列表变成集合 list_1 = [1,4,5,,3,,6,9] list_1 = set(list_1) print(list_1,type(list_1)) 执行结果: {1, 3, 4, 5, 6, , 9} <class 'set'> ###set就是集合的意思,重复的数据已经没有…

# encoding: utf-8 # module builtins # from (built-in) # by generator 1.147 """ Built-in functions, exceptions, and other objects. Noteworthy: None is the `nil' object; Ellipsis represents `...' in slices. """ # no imports # V…

# encoding: utf-8 # module builtins # from (built-in) # by generator 1.147 """ Built-in functions, exceptions, and other objects. Noteworthy: None is the `nil' object; Ellipsis represents `...' in slices. """ # no imports # V…

# encoding: utf-8 # module builtins # from (built-in) # by generator 1.147 """ Built-in functions, exceptions, and other objects. Noteworthy: None is the `nil' object; Ellipsis represents `...' in slices. """ # no imports # V…

# encoding: utf-8 # module builtins # from (built-in) # by generator 1.147 """ Built-in functions, exceptions, and other objects. Noteworthy: None is the `nil' object; Ellipsis represents `...' in slices. """ # no imports # V…

# encoding: utf-8 # module builtins # from (built-in) # by generator 1.147 """ Built-in functions, exceptions, and other objects. Noteworthy: None is the `nil' object; Ellipsis represents `...' in slices. """ # no imports # V…

# encoding: utf-8 # module builtins # from (built-in) # by generator 1.147 """ Built-in functions, exceptions, and other objects. Noteworthy: None is the `nil' object; Ellipsis represents `...' in slices. """ # no imports # V…

# encoding: utf-8 # module builtins # from (built-in) # by generator 1.147 """ Built-in functions, exceptions, and other objects. Noteworthy: None is the `nil' object; Ellipsis represents `...' in slices. """ # no imports # V…

URL配置 基本格式 from django.conf.urls import url #循环urlpatterns,找到对应的函数执行,匹配上一个路径就找到对应的函数执行,就不再往下循环了,并给函数传一个参数request,和wsgiref的environ类似,就是请求信息的所有内容 urlpatterns = [ url(正则表达式, views视图函数,参数,别名), ] urls.py from app01 import views urlpatterns = [ url(r'^admi…

1. 操作系统有什么用? #1外部指令转化成0和1:#2.翻译所写的字符从繁(高低电压)至简(想做什么就做什么) :#3把一些硬件的复杂操作简化成一个一个接口. 2. 计算机由哪三大部分组成? 1.应用程序:2操作系统:3.硬件 1. 简述操作系统和应用程序的启动流程? 1.操作系统启动流程 开机启动ROM存储器,ROM临时充当CPU控制CMOS(CMOS中含有操作系统的代码途径),之后让CPU运行操作系统. 2.应用程序启动流程 双击应用程序 发出指令给操作系统 操作系统控制CPU发送指令给内…